reciprocāˈtion noun

recipˈrocātive adjective

Characterized by or inclined to reciprocation

recipˈrocātor noun

1. A person or thing that reciprocates
2. A double-acting steam-engine

reciprocity /res-i-prosˈi-ti/ noun

1. Reciprocal action
2. Mutual relation
3. Concession of mutual privileges or advantages, esp mutual tariff concessions

reciprocal cross noun (biology)

A cross made both ways with regard to sex, ie A♂×B♀ and B♂×A♀

reciprocal translocation noun (biology)

Mutual exchange of non-homologous portions between two chromosomes

reciprocating engine noun

An engine in which the piston moves to and fro in a straight line

reciprocity failure noun (photography)

Failure of the reciprocity rule for extremely long or short exposure times, or at very high or low light intensities

reciprocity principle noun (physics)

One stating that the interchange of radiation source and detector will not change the level of radiation at the latter, whatever the shielding arrangement between them

reciprocity rule noun (photography)

The principle that an increase in light intensity should be compensated for by a proportionate decrease in time exposure and vice versa